Paraplegia due to actinomyces viscosus infection in the cat

In a 3 year old female domestic cat a suppurative, granulomatous lesion of the tail and sacral area penetrated into the epidural space, causing paraplegia. A viscosus was isolated from the inflammatory tissues. A comparative light and electronmicroscopic study of the bacterial elements and the architecture of the granules (Drusen) show that the latter are in-vivo microcolonies of the agent.